Variable expenses are those expenses that track directly with sales. If sales stop they stop. These are expenses like supplies used to support in the making of your product or doing your service. Such things as shipping cost for raw materials for your product or service. If you have no sales then you're not going to be purchasing materials so your shipping cost for those materials will stop as well. As an example, if you have a lawn mowing business and there are no lawns to mow, then you wouldn't be buying gasoline to travel to your lawn mowing site. These kinds of things are variable expenses. If you're producing a product, it would include supplies used to produce that product like sand paper, glue, finishing materials, cutting tools, etc.
Everyone has prepared a business plan. Well, should that read, everyone should have prepared a business plan? My thinking is that these tend only to be prepared when they are needed, rather than as a useful business tool for all senior management. My top five ingredients are: 1. Understand what a business plan is; 2. Understand what you intend to use it for; 3. Identify and implement the critical steps to achieving a successful business plan; 4. Understand what needs to be included in the plan; 5. Be aware of gaps or weaknesses in your plan.